I had this problem too on my Lenovo Ideapad z360 and kernel 2.6.32-24-generic. After upgrade to 2.6.35 (downloaded from kernel ppa) it seems to work fine.
2.6.35-02063505-generic #201009211107 SMP Tue Sep 21 11:09:35 UTC 2010 x86_64 GNU/Linux
I had this problem too on my Lenovo Ideapad z360 and kernel 2.6.32-24-generic. After upgrade to 2.6.35 (downloaded from kernel ppa) it seems to work fine.
2.6.35- 02063505- generic #201009211107 SMP Tue Sep 21 11:09:35 UTC 2010 x86_64 GNU/Linux